#include <stdio.h>
#include <pthread.h>
#include <math.h>

int a, b, c;
float delta, r1, r2;

void* solve_equation(void* args) {
    delta = sqrt(b*b-4*a*c);
    if(delta < 0)
        printf("The equation has no roots.\n");
    if(delta == 0) {
        r1 = -b/(2*a);
        printf("The equaion has one root: %0.2f\n", r1);
    }
    if(delta>0) {
        r1 = (-b + sqrt(delta)) / (2*a);
        r2 = (-b - sqrt(delta)) / (2*a);
        printf("root 1=%.2f\nroot 2=%.2f", r1, r2);
    }
    pthread_exit(0);
}

int main() {
    pthread_t thrd;
    a=1;
    b=-5;
    c=6;
    pthread_create(&thrd, NULL, solve_equation, NULL);
    pthread_join(thrd, NULL);
    return 0;
}